Head to head
AssemblyAI vs Gladia
As a speech-to-text API, AssemblyAI rates higher on the APIbenchmarks Index, 86.9 to 74, a 12.9-point gap. Here is how they compare on each criterion.
Criterion by criterion
| Criterion | AssemblyAI | Gladia |
|---|---|---|
| Documentation & DX | ||
| Reliability | ||
| Ecosystem & SDKs | ||
| Accessibility | ||
| APIbenchmarks Index | 86.9 | 74.0 |
Specifications
| AssemblyAI | Gladia | |
|---|---|---|
| Best for | Accurate STT plus audio intelligence | All-inclusive STT for voice products |
| Free tier | $50 one-time credit | 10 hrs/mo |
| Pricing | Per minute (usage-based) | Per hour (usage-based) |
| Official SDKs | 7 languages | 6 languages |
Is AssemblyAI better than Gladia?
On the APIbenchmarks Index, AssemblyAI rates higher (86.9 vs 74). It leads on the four weighted criteria, but price is reported separately, so the best choice still depends on your budget.
Verdict in one line
AssemblyAI leads by 12.9 points (86.9 vs 74) and wins 4 of 4 criteria.
Winner by criterion
| Criterion | Winner | ||
|---|---|---|---|
| Documentation & DX | 92 | 78 | |
| Reliability | 82 | 70 | |
| Ecosystem & SDKs | 83 | 62 | |
| Accessibility | 90 | 88 |
Choose AssemblyAI if… / choose Gladia if…
- →documentation & dx matters most to you (92 vs 78)
- →reliability matters most to you (82 vs 70)
- →ecosystem & sdks matters most to you (83 vs 62)
- →accessibility matters most to you (90 vs 88)
- →you need broad SDK coverage (7 official SDKs vs 6)
- →your use case matches its focus: accurate stt plus audio intelligence
- →your use case matches its focus: all-inclusive stt for voice products
Pricing side by side
- Model
- Per minute (usage-based)
- Free tier
- $50 one-time credit
- Free credits$50 free
- Universal-2 (async STT)$0.15/hr
- Universal-3 Pro (async STT)$0.21/hr
- Universal-Streaming$0.15/hr
- Voice Agent API$4.50/hr ($0.075/min)
- EnterpriseCustom
- Model
- Per hour (usage-based)
- Free tier
- 10 hrs/mo
- Free$0 (10 hrs/month)
- Starter (Pay-as-you-go)$0.61/hr async, $0.75/hr real-time
- Growth (Commitment)from $0.20/hr async, $0.25/hr real-time
- EnterpriseCustom (annual)
Vendor-published pricing, verified 2026-06-27 (AssemblyAI) and 2026-06-27 (Gladia).
SDK and language coverage
Both · 2
PythonREST API
Only AssemblyAI · 5
JavaScript / TypeScriptJava (maintenance)Go (maintenance)WebSocket streaming APIMicrosoft Power Platform connector
Only Gladia · 4
Node.js / JavaScript (official SDK)WebSocket streaming reference clientsGladiaPy (community Python client)AWS Marketplace listing
Strengths and weaknesses
- +Strong English accuracy, Universal-2 ~6.68% WER beats Whisper large-v3 (~7.88%) in published comparisons
- +Very low base price ($0.15/hr async), far cheaper than Amazon Transcribe (~$1.44/hr) for comparable English STT
- +Clean, low-cleanup output: reliable punctuation, casing, proper nouns and alphanumerics (order numbers, etc.)
- –Add-on features (diarization, entity detection, redaction, translation) stack on the base rate, pushing effective cost well above the $0.15/hr headline (~$0.35/hr in independent estimates)
- –Cost becomes expensive at high audio volume for usage-heavy apps
- –Some users report inconsistent real-time latency under load, hurting predictability for live use cases
- +Audio-intelligence features (diarization, translation, sentiment, PII redaction, language detection) are bundled into the base per-hour price rather than billed as separate add-ons
- +Strong, third-party-dataset accuracy on Solaria-3: 6.4% WER on Earnings22 business audio, beating AssemblyAI, ElevenLabs, Speechmatics, and Deepgram
- +Very competitive pricing with a real 10-hour/month free tier and committed rates as low as ~$0.20/hr async
- –Most published accuracy/latency benchmarks are vendor-run by Gladia itself, with limited fully independent third-party validation
- –Smaller ecosystem and community than US incumbents (fewer official SDKs, less third-party tooling and review volume)
- –No public status-page uptime figures; reliability rests on contractual SLAs rather than transparent metrics
AssemblyAI vs Gladia: questions
- Which has better documentation, AssemblyAI or Gladia?
- AssemblyAI scores higher on documentation and developer experience: 92 vs 78 out of 100.
- Which is more reliable, AssemblyAI or Gladia?
- AssemblyAI scores higher on reliability: 82 vs 70 out of 100.
- Do AssemblyAI and Gladia have a free tier?
- AssemblyAI: yes ($50 one-time credit). Gladia: yes (10 hrs/mo).
- How are AssemblyAI and Gladia priced?
- AssemblyAI: Per minute (usage-based). Gladia: Per hour (usage-based).
- Which has more official SDKs?
- AssemblyAI lists 7 official SDKs, Gladia lists 6.